Winding-key for film-cameras and roll-holders.



PATENTED JAN. 29,1907,

0. BORNMANN. FOR FILM CAMERAS AND ROLL HOLDERS! APPLICATION FILEDSEPT.1,1906.

UNITED STATES PATENT OFFICE.

CARL BORNMANN, or NEW'HAVEN, CONNECTICUT, ASSIGNOR To THE ANTHONY &SCOVILL COMPANY, or BINGHAMTON, NEW YORK.

Specification of Letters Patent.

Patented Jan. 29, 1907.

Application filed September 1, 1906. Serial No 332,895.

To on whom, it may concern:

Be it known that I, CARL BoRNMANN, a citizen of the United States, and aresident in the city and county of New Haven, State of Connecticut, haveinvented a new and useful Improvement in WVinding-Keys for Film- Camerasand Roll-Holders, of which the following is a specification, referencebeing had to the accompanying drawings, in which Figure 1 illustrates asectional view of the invention, shown partly in elevation. Fig. 2illustrates an endwise view of the invention, the spindle of the keybeing cross-sectioned just inside of the exterior confining-plate and itand the thumb-piece of the key being removed. Fig. 3 illustrates a planview of the exterior confining-plate.

The purpose of the invention is to provide a winding-key which shall befree from ratchets and pawls and pawl-actuating springs, simple andinexpensive in construction, and reliable in operation, thus correctingcertain defects in winding-keys as now made.

A represents the side of a camera-box or roll-holder, as the case maybe; B, the spool; C, the spindle of the winding-key, provided with theusual transverse bar D or its equivalent; E, the thumb-piece for thekey; F, the exterior confining-plate, which is attached to a casing G,set into the part A by screws H or other suitable means. These parts areor may be similar to the like parts as now frequently used. The novelfeatures are as follows: I represents a metallic pin, fastened in a holedrilled through the spindle, the ends of the pin being beveled inreverse directions, as seen at J and K. L represents a bushing fittedwithin the casing G, so as to turn easily therein. This bushing ishollow and has two holes bored in it, within which easily slide twopinsM and N, the inner ends whereof project inwardly into two cavities O0, made in the interior wall of the hollow bushing. These cavities haveeach one wall P P, which is substantially radial to the axis of the bushing against which the square laterally-projecting surfaces Q Q of thepin I may engage. The confining-plate F has two short springs R R cutout from it.

The operation is as follows When the parts are assembled, the springs RR press upon the opposed surface of the bushing and act as a brakethereon, retarding its revolution. Upon winding the key to advance thefilm the surfaces Q Q of the pin I, which project from the sides of thespindle and rest in the cavities O O of the bushing, engage with thesubstantially radial sides P P of the cavities and compel the bushing torotate with the spindle and spool. Thus the film is advanced in theusual manner. Upon the completion of the forward winding the operatormerely releases the winding-key, whereupon the tension of the film tendsto unwind the spool, and consequently the key; but the a friction of thesprings R R of the confiningplate retards the backward movement of thebushing, thus immediately bringing the beveled sides .of the projectingends of the pin-I against the inwardly-projecting ends J K of the loosepins M N, whereby they are made to slide radially through the holes inthe bushing in which they rest and press against the inner wall of thecasing G with suflicient force to lock the winding-key, and consequentlythe spool with which it is engaged, by the transverse bar D in its thenposition, thus preventing backward move ment or turning. Upon againturning the thumb-piece E forwardly the beveled surfaces of the pin Ileave the pins M and N and its square surfaces again come immediately incontact with the radial surfaces P P of the bushing, whereby the film isagain advanced and the operation thus repeated.

It will be obvious to those who are familiar with such matters that thespecial embodiment of my invention illustrated in the drawings is oneform only in which the invention may be employed. I do not, therefore,limit myself to the illustrated construction, except as the scope of theclaims requires.

I claim-- 1. A winding-key embodying a rotary spindle, a bushing,movable parts carried by the bushing, an outer casing, and projectionsfrom the spindle which, when it is turned in one direction, engage withthe bushing and compel it to turn in the same direction, but when turnedin the reverse direction engage the movable parts carried by the bushingforcing them against the outer casing, thus locking the parts againstsuch reverse movement.

2. A winding-key embodying a rotary spindle, a bushing and an outercasing, movable devices carried by the bushing and means interposedbetween the spindle and the bushing which, when the spindle is rotatedin one direction, engage with the bushing and when in the reversedirection with the movable parts, forcing them against the casing.

3. A winding-key embodying a rotary spindle, a bushing and an outercasing, movable devices carried by the bushing and means interposedbetween the spindle and the bushing which, when the spindle is rotatedin one direction, engage wlth the bushing and when in the reversedirection with the movable parts, forcing them against the casing, andmeans to initially retard the re- :5 verse movement of the bushing.

In testimony whereof I have signed my name to this specification in thepresence of two subscribing witnesses.

CARL BORNMANN.

l/Vitnesses:

R. W. SMITH, F. J. MATHEIU.

